How popular is Jovin?

Jovin is an unusual given name for men but a somewhat prominent last name for both adults and children (#103193 out of 150436, Top 69%). (2000 U.S. Census)

Which version is better?

with its source form and related boy names. Jovan(#1154 in 2015), Jovani(#963), Jovanni(#1049), Jovanny(#1625), Jovany and Jovon are the popular varying forms of Jovin (outside Top 2000). Other forms, like Jeovani, are uncommon. These forms of Jovin were popular with parents in 2006 (usage of 0.07%) and are somewhat less widespread today (usage 0.04%, ▼48.2%), with the version Jovany becoming less in vogue. (Top Baby Names, 2015)